Tool for chipping carbon deposits



April 7, 1959 R, S E DER 2,880,434

TOOL FOR QHIPPING CARBON DEPOSITS Filed Nov. 28, 1955 INVEVTOR. 2040/4 csaw e United States Patent TOOL FOR CHIPPING. CARBON DEPOSITS Ralph C.Steider, Boise, Idaho Application November 28, 1955, Serial No. 549,329

' 4 Claims. (Cl. 1s-s9 particular are susceptible to considerable carbonincrustation, and must be cleaned. The common practice in cleaning thesemembers is' to strike two of them together until the carbon deposits areloosened, and then bulf them clean on a wire brush attachment to a benchgrinder. While this method of cleaning does suffice to clean the valves,

it takes considerable time, especially when hard deposits are present.Frequently many blows are required to loosen such hard deposits and muchtime is consumed.

It is the purpose of this invention to provide a tool which may beattached to a rotating shaft and which has a plurality of chippingsurfaces adapted to strike repeated blows to loosen carbon deposits fromobjects held thereagainst.

More specifically it is the purpose to provide such a tool which may bethreaded onto the rotating shaft of a bench grinder and which has suchchipping surfaces adapted to loosen carbon deposits from automotiveparts such as intake and exhaust valves.

The nature and advantages of my invention will appear more clearly fromthe following description and the accompanying drawings, wherein apreferred form of the invention is shown. It should be understood,however, that the drawings and description are illustrative only and arenot intended to limit the invention, except insofar as it is limited bythe claims.

In the drawings:

Figure l is a perspective view of the invention;

Figure 2 is an end view of the tool shown in Figure 1;

Figure 3 is a sectional view taken on the line 33 of Figure 2;

Figure 4 is a view illustrating the tool as mounted on a bench grinder;and

Figure 5 is a fragmentary view illustrating the tool in use.

Referring now to the drawings, and to Figures 1, 2 and 3 in particular,my improved carbon chipping tool, generally indicated by the numeral 10comprises a cylindrical metal shaft 11 having an enlarged connectinghead 12 formed at one end thereof. The connecting head 12, as shown inFigure 3, has a threaded aperture 13 therein extending axially of theshaft 11. The aperture 13 is adapted to receive the threaded end of arotatable shaft as described later herein.

The shaft 11 has an enlarged portion 14 thereon near the head 12 wherebyto provide a shoulder 15. A chipping member 16 is mounted on the shaft11 and seats against the shoulder 15. The chipping member is nonslidablyand non-rotatably mounted by means of a set screw 17. As shown inFigures 1 and 2 the chipping member 16 is hexagonal in cross section,having six plane surfaces 18 which meet in sharp edges 19. The edges 19extend from one face of the member 16 to the opposite face, to providesharp corners 20. It may be seen that upon rotation of the tool 10, theedges 19 and corners 20 will strike repeated blows at objects heldthereagainst. While the member 16 is shown as hexagonal in the drawings,it should be understood that other polygonal configurations wouldsuflice, including a triangle, square, pentagon, etc. However, polygonalshapes having a large number of sides, as for example a twelve orfourteen sided polygon, are not practical, since the meeting edges'ofthe plane surfaces in such figures are not spaced radially outward fromthe plane surfaces a sufficient distance to cause upon rotation,appreciable jarring of an object held against the surfaces.

In order to provide a second chipping member on the tool 10, the freeend of the shaft 11 is formed as a tapered hexagonal chipping bitindicated at 21 in the drawings. The tapered hexagonal bit 21 is formedby cutting six converging plane surfaces 22 at the free end of the shaft11. The surfaces 22 meet-in sharp edges 23 which, upon rotation of thetool 10, will strike blows on an object held thereagainst.

As may be seen in the drawings, the two chipping members 16 and 21 arespaced a considerable distance apart, so that a valve held against oneof the surfaces wont engage the othersurface accidentally. The length ofshaft 11 between the two chipping members is cylindrical, so that valvesbeing cleaned by the member 16 and accidentally allowed to contact theshaft 11 will not be struck and damaged by engagement with the shaft 11,as would be the case if the shaft 11 were polygonal in cross section.

As hereinbefore described, in cleaning carbon incrusted valves the hardcarbon deposits must first be chipped loose, and then the valves buffedclean. The bufling is usually accomplished with a circular wire brushattachment on a standard bench grinder. Such a grinder is shown at 24 inFigure 4. The Wire brush attachment is indicated at 25. I have found itvery convenient to mount my improved chipping tool 10 on the shaft ofthe grinder 24 adjacent the brush 25. The tool 10 may be so mounted byremoving the nut which normally holds the brush 25 on the shaft, andreplacing it with the tool 10. In this way the tool 10 is mounted forrotation in close proximity to the wire brush 25 so that the two may beused together for cleaning carbon incrusted valves.

The method of using the tool 10 is illustrated in Figures 4 and 5. Thevalve, indicated at 26 is grasped by the stem, and the incrustedportions held against either of the whirling chipping members 16 or 21.The whirling projecting edges 19 or 23 strike repeated blows on thecarbon deposits to loosen them. As may be seen from the drawings, themember 16 and the bit 21 provide chipping surfaces Which are capable ofreaching all parts of the valves 26.

It is believed that the nature and advantages of the invention appearclearly from the foregoing description.

Having thus described the invention, I claim:

1. A tool for chipping carbon deposits from articles such as valves ofinternal combustion engines comprising a connecting head having meansfor securing said head to a rotating shaft, a rigid shaft portionsecured to said connecting head and extending axially of the rotatingshaft upon which the head is secured, said shaft portion having achipping member thereon intermediate the head and the free end of theshaft portion, said chipping member being polygonal in cross sectionwhereby to provide a plurality of projecting edges on its surfaceoperable to strike repeated blows upon objects held thereagainst whenthe tool is rotated, said shaft portion having a polygonal end portionat the free end thereof whereby to provide projecting edges thereonoperable to strike blows to objects held thereagainst when the tool isrotated, and said polygonal end portion being spaced from the chippingmember, the portion of the shaft between the polygonal end portion andthe chipping member being cylindrical whereby to allow objects to makecontact therewith without being struck by sharp corners.

2. A tool for chipping carbon deposits from articles such as valves ofinternal combustion engines comprising a rigid cylindrical shaft, anenlarged head portion on said shaft, said head portion having a centralaperture therein extending axially of the shaft, whereby to mount thetool for rotation about the axis of the shaft, a chipping member fixedlysecured on said shaft, said chipping member being polygonal in crosssection whereby to provide a plurality of projecting edges on itssurface operable to strike repeated blows upon objects held thereagainstwhen the tool is rotated, said shaft having a tapered polygonal endportion thereon, said end portion being formed of a plurality ofconverging plane surfaces intersecting each other in sharp edges, saidsharp edges operable to strike repeated blows upon objects heldthereagainst when the tool is rotated, and said end portion being spacedfrom the chipping member.

3. A tool for chipping carbon deposits from articles such as valves ofinternal combustion engines comprising a rigid cylindrical shaft, anenlarged head portion on said shaft, said head portion having a centralaperture therein extending axially of the shaft, whereby to mount thetool for rotation about the aXis of the shaft, a chipping member fixedlysecured on said shaft, said chipping member being hexagonal in crosssection whereby to provide a plurality of projecting edges on itssurface operable to strike 4' repeated blows upon objects heldthereagainst when the tool is rotated, said shaft having a taperedhexagonal end portion thereon, said end portion being formed of aplurality of converging plane surfaces intersecting each other in sharpedges, said sharp edges operable to strike repeated blows upon objectsheld thereagainst when the tool is rotated, and said end portion beingspaced from the chipping member.

4. A tool for chipping carbon deposits from articles such as valves ofinternal combustion engines comprising a connecting head having meansfor securing said head to a rotating shaft, a rigid shaft portionsecured to said connecting head and extending axially of the rotatingshaft upon which the head is secured, said shaft portion having achipping member thereon intermediate the head and the free end of theshaft portion, said chipping member being polygonal in cross sectionwhereby to provide a plurality of projecting edges on its surfaceoperable to strike repeated blows upon objects held thereagainst whenthe tool is rotated, said shaft portion having a polygonal end portionat the free end thereof whereby to provide projecting edges thereonoperable to strike blows to objects held thereagainst when the tool isrotated, and said polygonal end portion being spaced from thechippingmember.

References Cited in the file of this patent UNITED STATES PATENTS1,053,007 Calvert Feb. 11, 1913 2,101,394 Johnson Dec. 7, 1937 2,104,900Holhut Jan. 11, 1938

